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chemical change (kem kl chnj) the
changing of a substance or kind of
matter into a different kind of matter
with different properties (
p. 375)
chemical equation (kem kl i kw zhn)
a formula that describes a chemical
reaction (
p. 378)
chemical reaction (kem kl r ak shn)
when one or more substances change
into other substances with different
chemical properties (
p. 378)
chemical weathering (kem kl
we r ing) the changing of materials
in a rock by chemical processes (
p. 272)
chloroplast (klôr plast) green part of a
plant cell that uses the energy in
sunlight to turn water and carbon dioxide
into oxygen and sugar (
p. 40)
circuit diagram (sr kit d gram) a map
of a circuit with symbols for each part
(
p. 484)
class (klas) the level of classification below
phylum (
p. 8)
classifying (klas f ing) to put something
into a group (
p. 7)
climate (kl mit) the average of weather
conditions over a long time (
p. 246)
collecting data (k lekt ing d t)
gathering observations and measurement
into graphs, tables or charts (
p. 190)
combustion (km bus chn) the process
of burning (
p. 377)
comet (kom it) a frozen mass of ice and
dust orbiting the Sun (
p. 552)
communicating (k myü n kt ing) using
words, pictures, charts, graphs, and
diagrams to share information (
p. 119)
community (k myü n t) the group of all
the populations in an area (
p. 127)
compare (km pâr) reading skill that
shows how subjects are alike (
p. 5)
compound (kom pound) a substance made
up of a combination of two or more
elements held together by chemical
bonds that cannot be separated by
physical means (
p. 350)
concentrated (kon sn trt d) having a
large amount of solute in a solution in
comparison with the amount of solvent
(
p. 361)
conclusion (kn klü zhn) a decision
reached after thinking about facts and
details (p.s
37, 229, 373)
condensation (kon den s shn) the changing
of a gas into a liquid (
p. 209)
conduction (kn duk shn) transfer of thermal
energy between objects that are in contact
(
p. 465)
conductor (kn duk tr) a material through which
electric charge flows easily (
p. 480)
conservation (kon sr v shn) careful use of
natural resources (
p. 318)
constellation (kon st l shn) a group of stars
that forms a pattern (
p. 526)
consumer (kn sü mr) an organism that eats
other organisms (
p. 144)
contrast (kn trast) to point out how things are
different (
p. 5)
convection (kn vek shn) the movement of
warm liquids or gases to cooler areas (
p. 464)
convection current (kn vek shn kr nt)
when solids, gases, or liquids rise and sink
in a looping path (
p. 232)
core (kôr) the center part of Earth which includes
the liquid outer core and solid inner core
(
p. 264)
crust (krust) the outermost and thinnest of Earth’s
layers (
p. 264)
current (kr nt) the flow of electric charge
through a material (
p. 479)
cycle (s kl) a repeating process or flow of
material through a system (
p. 149)
cytoplasm (s t plaz m) all the material of the
cell between the cell membrane and the
nucleus (
p. 40)
 
decomposer (d km p zr) an organism that
gets nutrients by breaking down dead
organisms (
p. 144)
density (den s t) the mass of a substance
divided by its volume (
p. 345)
deposition (dep zish n) the laying down of
material in a natural process (
p. 276)
details (di tlz) individual pieces of information
that support a main idea (
p. 301)
dilute (d lüt) having little solute in a solution
in comparison with the amount of solvent
(
p. 361)